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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0a8d59148d71777e28c1e7d8ca744b753457c159044a119e5859a84ec0756d' 
  AND token = 'UBK6/7eWOWXEhKrAhtIIJGLP2f1weO5qnVeyaQpKdP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}